Urgent Base - Mainnet - Upgrade to v1.4.1

Scheduled for Sep 28, 00:00 UTC - Sep 29, 00:00 UTC

Scheduled

We are upgrading our Base Mainnet infrastructure to v1.4.1 on 2026-09-28.

This release introduces support for the Cobalt hardfork, a consensus-critical network upgrade.
Brief interruptions to RPC availability may occur on that date.

https://github.com/base/base/releases/tag/v1.4.1

Posted Sep 23, 2026 - 17:35 UTC

This scheduled maintenance affects: Base (Mainnet — JSON-RPC API).